extracellular isoamylase complex GO:0010367 A protein complex whose composition varies amongst species; in rice it probably exists in a homo-tetramer to homo-hexamer form and in Gram negative bacteria as a dimer. Functions in the hydrolysis of alpha-(1,6)-D-glucosidic branch linkages. Isoamylases in animals are localized in the extracellular space. cellular_component extracellular protein-containing complex